CN112212357A - Gas quantity control method, gas wall-mounted furnace, gas water heater and heating and ventilation system - Google Patents
Gas quantity control method, gas wall-mounted furnace, gas water heater and heating and ventilation system Download PDFInfo
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- CN112212357A CN112212357A CN201910614100.6A CN201910614100A CN112212357A CN 112212357 A CN112212357 A CN 112212357A CN 201910614100 A CN201910614100 A CN 201910614100A CN 112212357 A CN112212357 A CN 112212357A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 title claims abstract description 15
- 238000009423 ventilation Methods 0.000 title abstract description 7
- 238000007664 blowing Methods 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 2
- 239000000779 smoke Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 242
- 239000003570 air Substances 0.000 description 51
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 239000012080 ambient air Substances 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/005—Regulating fuel supply using electrical or electromechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
Abstract
The invention relates to a gas quantity control method, a gas wall-mounted furnace, a gas water heater and a heating and ventilation system, wherein a gas device comprises: the control method comprises the following steps: acquiring the gas quantity required currently, and acquiring the current standard current of the proportional valve under the standard working condition according to the gas quantity required currently; acquiring a current wind pressure value of the fan; obtaining a current compensation value of the proportional valve according to the current wind pressure value and the current required gas quantity; obtaining the current target current of the proportional valve according to the current standard current and the current compensation value; and adjusting the current opening of the proportional valve according to the current target current so as to control the gas quantity of the gas device. The invention can dynamically adjust the gas quantity according to the change of the air pressure value, improves the resistance capacity of the gas device, and effectively reduces or eliminates the risks of flameout, smoke exceeding and rated load change by matching with air quantity compensation when the impedance of the exhaust pipe or the external resistance changes.
Description
Technical Field
The invention relates to the field of gas control, in particular to a gas quantity control method, a gas wall-mounted boiler, a gas water heater and a heating and ventilating system.
Background
The existing gas wall-mounted furnace, gas water heater and the like do not dynamically adjust the gas quantity according to the actual working condition of a product in the gas quantity adjusting process, so that the phenomenon of air-fuel ratio imbalance easily occurs under the complex working condition.
Specifically, as shown in FIG. 1, the pressure difference across the nozzle is Δ pg＝(p3+Δp2)-p1Wherein Δ p2The secondary pressure output by the proportional valve. Under the condition of fixed nozzle aperture, aperture length, nozzle number and other structural dimensions, the gas quantity is only determined by the pressure difference deltap between the front and the rear of the nozzlegThe relationship can be generally expressed as:
the following relationship can thus be obtained:
the function of the proportional valve is to regulate the secondary pressure delta p after the valve by the proportional valve current I2. Typically, the proportional valve manufacturer will provide the proportional valve current I and the secondary pressure Δ p2The characteristic curve between, here expressed as a function:
Δp2＝g(I)；
an expression for the proportional valve current is thus obtained:
as can be seen from fig. 1, the differential pressure Δ p ═ p1-p3The pressure difference between the air outlet and the air inlet of the fan, namely the wind pressure referred to herein, can be considered. Under standard working conditions, if the gas quantity QgIt has been determined that the air amount can be determined to maintain an appropriate air-fuel ratio, and the wind pressure Δ p can be determined if the air amount is determined. Therefore, under the standard working condition (the standard working condition refers to a specific ideal working condition of the gas water heater, and the conditions can refer to the conditions of '7.1 laboratory conditions' and '7.2 experimental gas conditions' in the national standard 'domestic gas quick water heater GB 6932-2015'Wherein the gas is the reference gas under the condition of 7.2 test gas. ) The gas quantity is determined only by the secondary pressure Δ p of the proportional valve2. However, when the impedance of the air supply and exhaust pipe or the external resistance (such as strong wind weather) changes, the air pressure Δ p under the same air quantity changes, and the gas quantity is influenced. Current control schemes in the industry typically ignore changes in Δ p, and when changes occur in the exhaust pipe line impedance or external resistance, the fuel flow is adjusted using only the proportional valve current without compensating for the changes in Δ p. Therefore, the air-fuel ratio cannot be well adjusted, and the rated loads of the water heater and the wall-hanging stove are easy to change.
Disclosure of Invention
The invention aims to solve the technical problem of providing a gas quantity control method, a gas wall-mounted boiler, a gas water heater and a heating and ventilation system aiming at the defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: there is provided a gas amount control method for controlling a gas amount of a gas appliance including: the chamber, be used for to the fan of air blast in the chamber and be used for adjusting the proportional valve of gas intake, the method includes:
acquiring the gas quantity required currently, and acquiring the current standard current of the proportional valve under the standard working condition according to the gas quantity required currently;
acquiring a current wind pressure value of the fan; the current wind pressure value of the fan is the difference value of the air pressure value of the fan outlet and the air pressure value of the fan inlet;
obtaining a current compensation value of the proportional valve according to the current wind pressure value and the currently required gas quantity;
obtaining the current target current of the proportional valve according to the current standard current and the current compensation value;
and adjusting the current opening of the proportional valve according to the current target current so as to control the gas quantity of the gas device.
In one embodiment, the current wind pressure value is obtained by sensor detection;
or, the current wind pressure value is obtained by calculation according to the characteristics of the fan and the parameters of the fan.
In one embodiment, the obtaining of the current standard current of the proportional valve under the standard condition according to the current required gas quantity comprises:
based on the currently required gas quantity, acquiring the current standard current of the proportional valve corresponding to the currently required gas quantity under a standard working condition according to the first corresponding relation between the gas quantity and the standard current of the proportional valve;
wherein the first corresponding relation between the gas quantity and the standard current of the proportional valve is stored in a data table.
In one embodiment, the obtaining of the current compensation value of the proportional valve according to the current wind pressure value and the current required gas amount includes:
based on the current wind pressure value and the currently required gas quantity, acquiring a current compensation value of the proportional valve corresponding to the current wind pressure value and the currently required gas quantity according to a second corresponding relation of the gas quantity, the wind pressure value and the current compensation value; and storing a second corresponding relation of the gas quantity, the wind pressure value and the current compensation value in a data table.
In one embodiment, the method further comprises:
under a standard working condition, detecting the standard current of the proportional valve corresponding to each gas quantity by adjusting the gas quantity, thereby obtaining a first corresponding relation between the gas quantity and the standard current of the proportional valve.
In one embodiment, the obtaining the current target current of the proportional valve according to the current standard current and the current compensation value includes:
summing the present standard current and the present current compensation value to obtain the present target current.
The present invention also provides a gas amount control system including: the cavity, be used for to the fan of air-blowing in the cavity and be used for adjusting the proportional valve of gas intake volume still include:
the first acquisition unit is used for acquiring the currently required gas quantity and acquiring the current standard current of the proportional valve under the standard working condition according to the currently required gas quantity;
the second acquisition unit is used for acquiring the current wind pressure value of the fan; the current wind pressure value of the fan is the difference value of the air pressure value of the fan outlet and the air pressure value of the fan inlet;
the current compensation value acquisition unit is used for acquiring a current compensation value of the proportional valve according to the current wind pressure value and the currently required gas quantity;
the target current obtaining unit is used for obtaining the current target current of the proportional valve according to the current standard current and the current compensation value;
and the control unit is used for adjusting the current opening of the proportional valve according to the current target current so as to control the gas quantity of the gas device.
The invention also provides a wall-mounted gas stove, which comprises a chamber, a fan for blowing air into the chamber, and a proportional valve for adjusting the gas inflow, and is characterized by further comprising: a control device electrically connected to the proportional valve, the control device configured to:
acquiring the gas quantity required currently, and acquiring the current standard current of the proportional valve under the standard working condition according to the gas quantity required currently;
acquiring a current wind pressure value of the fan; the current wind pressure value of the fan is the difference value of the air pressure value of the fan outlet and the air pressure value of the fan inlet;
obtaining a current compensation value of the proportional valve according to the current wind pressure value and the currently required gas quantity;
obtaining the current target current of the proportional valve according to the current standard current and the current compensation value;
and adjusting the current opening of the proportional valve according to the current target current so as to control the gas quantity of the gas wall-hanging stove.
The invention also provides a gas water heater, which comprises a chamber, a fan for blowing air into the chamber, a proportional valve for adjusting the gas intake quantity, and further comprises: a controller electrically connected to the proportional valve, the controller configured to:
acquiring the gas quantity required currently, and acquiring the current standard current of the proportional valve under the standard working condition according to the gas quantity required currently;
acquiring a current wind pressure value of the fan; the current wind pressure value of the fan is the difference value of the air pressure value of the fan outlet and the air pressure value of the fan inlet;
obtaining a current compensation value of the proportional valve according to the current wind pressure value and the currently required gas quantity;
obtaining the current target current of the proportional valve according to the current standard current and the current compensation value;
and adjusting the current opening of the proportional valve according to the current target current so as to control the gas quantity of the gas water heater.
The invention also provides a gas heating and ventilation system, which comprises a chamber, a fan for blowing air into the chamber, a proportional valve for adjusting the gas inflow, and further comprises: the control chip is electrically connected with the proportional valve and is used for:
acquiring the gas quantity required currently, and acquiring the current standard current of the proportional valve under the standard working condition according to the gas quantity required currently;
acquiring a current wind pressure value of the fan; the current wind pressure value of the fan is the difference value of the air pressure value of the fan outlet and the air pressure value of the fan inlet;
obtaining a current compensation value of the proportional valve according to the current wind pressure value and the currently required gas quantity;
obtaining the current target current of the proportional valve according to the current standard current and the current compensation value;
and adjusting the current opening of the proportional valve according to the current target current so as to control the gas quantity of the gas heating and ventilating system.
The gas quantity control method has the following beneficial effects: the control method comprises the following steps: acquiring the gas quantity required currently, and acquiring the current standard current of the proportional valve under the standard working condition according to the gas quantity required currently; acquiring a current wind pressure value of the fan; obtaining a current compensation value of the proportional valve according to the current wind pressure value and the current required gas quantity; obtaining the current target current of the proportional valve according to the current standard current and the current compensation value; and adjusting the current opening of the proportional valve according to the current target current so as to control the gas quantity of the gas device. The invention can dynamically adjust the gas quantity according to the change of the air pressure value, improves the resistance capacity of the gas device, and can effectively reduce or eliminate the risks of flameout, smoke exceeding and rated load change by matching with air quantity compensation when the pipeline impedance or the external resistance of the gas exhaust pipe changes.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic gas path diagram of a gas combustion device provided by an embodiment of the invention;
FIG. 2 is a schematic view of the air path of the present invention;
fig. 3 is a schematic flow chart of a gas quantity control method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a gas path diagram of a gas combustion device is shown. The gas device can adjust and control the gas quantity of the gas device through the gas quantity control method provided by the embodiment of the invention, so that the gas device can dynamically adjust the gas quantity according to the change of the air pressure value, the resistance capacity of the gas device is improved, and the risks of flameout, over-standard smoke and rated load change can be effectively reduced or eliminated by matching with an air quantity compensation method when the impedance or the external resistance of a gas exhaust pipe pipeline changes. The gas devices include, but are not limited to, gas wall-mounted furnaces, gas water heaters, and the like.
As shown in fig. 1, the gas combustion apparatus includes: the chamber 20 and the fan 50 for blowing air into the chamber 20 further comprise a gas pipeline 10, a stop valve 101 and a proportional valve 102 which are arranged on the gas pipeline 10, a plurality of nozzles 201 which are arranged in the chamber 20, and further, a plurality of fire rows 202 which are arranged corresponding to the nozzles 201 are also arranged in the chamber 20. The proportional valve 102 is used for adjusting the gas intake amount.
Specifically, as shown in fig. 1, air may be blown into the chamber 20 by providing a blower 50. Of course, it is understood that the fan 50 may be disposed directly at the inlet of the chamber 20, in which case the fan 50 directly blows ambient air around the gas-fired device into the chamber 20 (where the ambient air around the gas-fired device is ambient air within the cabinet of the gas-fired device).
In the gas pipe 10, the gas enters the chamber 20 through the stop valve 101 and then through the proportional valve 102, is sent out by the nozzle 201, and is output through the fire outlet 202 to heat the water.
Fig. 3 is a schematic flow chart of a gas quantity control method according to an embodiment of the present invention. The gas quantity control method provided by the embodiment of the invention can be suitable for different structures of different types of complete machines, such as gas wall-mounted furnaces, gas water heaters and the like, and is also suitable for related heating and ventilation systems.
Specifically, as shown in fig. 3, the gas amount control method includes step S301, step S302, step S303, step S304, and step S305.
And S301, acquiring the currently required gas quantity, and acquiring the current standard current of the proportional valve 102 under the standard working condition according to the currently required gas quantity.
Wherein, the current required gas quantity can be obtained according to the power requirement of heating hot water and the gas heat value.
Further, the current standard current of the proportional valve 102 under the standard condition can be obtained by the following method:
based on the currently required gas quantity, the current standard current of the proportional valve 102 corresponding to the currently required gas quantity under the standard working condition is acquired according to the first corresponding relation between the gas quantity and the standard current of the proportional valve. Wherein a first corresponding relation between the gas quantity and the standard current of the proportional valve is stored in a data table.
In the embodiment of the invention, the first corresponding relation between the gas quantity and the standard current of the proportional valve can be actually measured by adopting a prototype, and the measured value is subjected to the establishment of the relation table and stored in the data table. The specific acquisition mode is as follows: under the standard working condition, the standard current of the proportional valve 102 corresponding to each gas quantity is detected by adjusting the gas quantity, so that a first corresponding relation between the gas quantity and the standard current of the proportional valve is obtained. Therefore, when any one of the currently required gas amounts is known, the current standard current of the proportional valve 102 corresponding to the currently required gas amount can be directly called from the data table.
Further, when the first correspondence relationship of the gas amount to the standard current of the proportional valve is expressed in a mathematical form, it can be expressed by the following equation:
wherein, Δ p0Is a standard wind pressure value, Q under a standard working conditiongAmount of gas currently required, I0Is the current standard current for the proportional valve 102.
It should be noted that, the standard wind pressure value Δ p under the standard working condition0Gas quantity Q dependent on the current demandgIs not independent of the variable, so that the standard current I of the proportional valve under standard operating conditions0Also only dependent on the currently demanded gas quantity Qg. The above formula (1) can be said to indicate the standard current I0With gasDemand QgHaving a functional relationship, i.e. the amount of gas Q which can be demanded by the currentgObtaining a standard current value I0And does not mean that the standard current value is necessarily calculated using this equation (equation 1).
And step S302, acquiring the current wind pressure value of the fan 50.
Specifically, the current wind pressure value is a difference between a current air pressure value at the outlet and an air pressure value at the inlet of the fan 50. As shown in FIG. 2, the air pressure at the outlet of the blower 50 has a value P1The air pressure at the inlet of the fan 50 has a value of P3Therefore, the current wind pressure value Δ p ═ p1-p3. Wherein the air pressure value P at the inlet of the fan 503To achieve the ambient pressure, it can be seen from fig. 1 that the inlet of the blower 50 is at the same ambient pressure as the proportional valve 102, and therefore the inlet of the blower 50 has the same ambient pressure as the proportional valve 102.
Here, the current wind pressure value of the fan 50 may be obtained in various manners, for example, the current wind pressure value may be directly detected by a sensor, and the sensor may be directly disposed at the inlet and close to the fan 50. The sensor may be a differential pressure sensor. Alternatively, in some other embodiments, the current wind pressure value may be estimated according to the characteristics of the fan 50 and the parameters of the fan 50. The parameters of the fan 50 include, but are not limited to, fan speed, fan voltage, fan current, fan power, fan torque, fan air volume, etc.
And step S303, obtaining a current compensation value of the proportional valve 102 according to the current wind pressure value and the current required gas quantity.
Specifically, the current compensation value of the proportional valve 102 can be obtained by:
and acquiring the current compensation value of the proportional valve 102 corresponding to the current wind pressure value and the current required gas quantity according to the second corresponding relation of the gas quantity, the wind pressure value and the current compensation value based on the current wind pressure value and the current required gas quantity. And storing the second corresponding relation of the gas quantity, the wind pressure value and the current compensation value in a data table.
In a specific application example, the standard current corresponding to each gas quantity can be detected by adjusting the gas quantity of a prototype under a standard working condition, so that a first corresponding relation between the gas quantity and the standard current of the proportional valve is obtained, and then the current target current is detected by adjusting the wind pressure value and the gas quantity, so that a third corresponding relation between the gas quantity, the wind pressure value and the target current is obtained. It should be noted that the first corresponding relationship and the third corresponding relationship are both a data table (hereinafter, the first corresponding relationship is defined as a first data table, and the third corresponding relationship is defined as a third data table), so after the first corresponding relationship and the third corresponding relationship are obtained, the corresponding data in the two data tables are subtracted to obtain a second corresponding relationship (defined as a second data table) of the gas quantity, the wind pressure value and the current compensation value, and the obtained second corresponding relationship of the gas quantity, the wind pressure value and the current compensation value is stored in the data table. The specific subtraction operation of the corresponding data in the two data tables is as follows: and selecting the gas quantity and the wind pressure value in the third data table, and subtracting the standard current corresponding to the corresponding gas quantity in the first data table from the corresponding target current to obtain a compensation current so as to obtain a second data table (namely a second corresponding relation of the gas quantity, the wind pressure value and the current compensation value). It is understood that, in other embodiments, the current target current may be obtained by directly using the first data table and the second data table without using the second data table in the subsequent implementation process of the entire gas quantity control method.
Further, when the second corresponding relationship of the gas amount, the wind pressure value, and the current compensation value is expressed in a mathematical form, it can be expressed by the following equation:
specifically, the current compensation value of the proportional valve 102 satisfies:
wherein the g function is the characteristic curve, Q, of the proportional valve 102gIs the gas quantity required currently, and is the current wind pressure value delta p0Is a standard wind pressure value under a standard working condition, and Delta I is a current supplementThe compensation value, k is a coefficient. From (equation 2), it can be seen that the current compensation value Δ I depends on the currently required gas quantity QgAnd the wind current pressure value Δ p.
Understandably, the gas quantity Q per the current demandgCorresponding determined Δ p0However, the current wind pressure value of the fan 50 is not Δ p under the actual condition0However, Δ p, that is, under the actual working condition, the current wind pressure value of the fan 50 is changed, and therefore, the actual current of the proportional valve 102 cannot be the standard current under the standard working condition, and therefore, the current of the proportional valve 102 needs to be properly compensated, and further, the current compensation value needs to be determined, and the actual current (i.e., the current target current) of the proportional valve 102 is obtained through the current compensation value.
It should be noted that the current compensation value Δ I and the current required gas quantity QgThe current wind pressure value delta p has a functional relation, namely the fuel gas quantity Q required at presentgThe two variables of the current wind pressure value Δ p obtain the current compensation value Δ I, and do not necessarily need to use the equation (2 equation) to calculate the current compensation value Δ I.
And step S304, obtaining the current target current of the proportional valve 102 according to the current standard current and the current compensation value.
Specifically, the current target current of the proportional valve 102 may be obtained by summing the obtained current standard current and the current compensation value. When expressed in mathematical form, there are:
I＝I0+ Δ I; (formula 3).
Wherein, I is the current target current.
In the embodiment of the invention, the gas quantity Q according to the current demandgAcquiring gas quantity Q corresponding to current demand from data tablegStandard current I of proportional valve 102 under corresponding standard working condition0Then, calling a second data table from the data table to acquire the gas quantity Q corresponding to the current demand from the second data tablegThe current compensation value delta I corresponding to the current wind pressure value is used for further obtaining the standard current I0Is in phase with the present current compensation value delta IThe current target current I of the proportional valve 102 is obtained by addition.
And S305, adjusting the current opening of the proportional valve 102 according to the current target current to control the gas quantity of the gas device.
Specifically, after the current target current of the proportional valve 102 is obtained, the current opening degree of the proportional valve 102 is adjusted according to the obtained current target current of the proportional valve 102, so that the current opening degree of the proportional valve 102 meets the actual opening degree requirement, and the gas quantity actually obtained in the chamber 20 is the currently required gas quantity (Q)g) So as to ensure that a sufficient gas quantity can be obtained in the cavity 20 and avoid the problems of idle combustion and the like.
According to the gas quantity control method, the current opening degree of the proportional valve 102 is dynamically adjusted according to the current wind pressure value, so that the gas quantity of the gas device is dynamically adjusted, the resistance capability of the gas device can be better enhanced, and the risks of flameout, smoke exceeding and rated load change can be effectively reduced or eliminated by matching with air quantity compensation when the pipeline impedance or the external resistance of the gas exhaust pipe changes.
Further, the invention also provides a gas quantity control system. Wherein, this gas volume control system includes: a chamber 20, a blower 50 for blowing air into the chamber 20, a shut-off valve 101 and a proportional valve 102 on the gas pipe 10. The gas quantity control system can be used for realizing the gas quantity control method disclosed by the embodiment of the invention.
Further, the gas amount control system further includes: the device comprises a first acquisition unit, a second acquisition unit, a current compensation value calculation unit, a target current acquisition unit and a control unit.
And the first acquisition unit is used for acquiring the currently required gas quantity and acquiring the current standard current of the proportional valve 102 under the standard working condition according to the currently required gas quantity.
Wherein, the current required gas quantity can be obtained according to the power requirement of heating hot water and the gas heat value.
Further, the current standard current of the proportional valve 102 under the standard condition can be obtained by the following method:
based on the currently required gas quantity, the current standard current of the proportional valve 102 corresponding to the currently required gas quantity under the standard working condition is acquired according to the first corresponding relation between the gas quantity and the standard current of the proportional valve. Wherein a first corresponding relation between the gas quantity and the standard current of the proportional valve is stored in a data table.
In the embodiment of the invention, the first corresponding relation between the gas quantity and the standard current of the proportional valve can be actually measured by adopting a prototype, and the measured value is subjected to the establishment of the relation table and stored in the data table. The specific acquisition mode is as follows: under the standard working condition, the standard current of the proportional valve 102 corresponding to each gas quantity is detected by adjusting the gas quantity, so that a first corresponding relation between the gas quantity and the standard current of the proportional valve is obtained. Therefore, when any one currently required gas quantity is obtained, the current standard current of the proportional valve 102 corresponding to the currently required gas quantity can be directly called from the data table.
And a second acquiring unit for acquiring the current wind pressure value of the fan 50.
Specifically, the current wind pressure value is a difference between a current air pressure value at the outlet and an air pressure value at the inlet of the fan 50. As shown in FIG. 2, the air pressure at the outlet of the blower 50 has a value P1The air pressure at the inlet of the fan 50 has a value of P3Therefore, the current wind pressure value Δ p ═ p1-p3. Wherein the air pressure value P at the inlet of the fan 503To achieve the ambient pressure, it can be seen from fig. 1 that the inlet of the blower 50 is at the same ambient pressure as the proportional valve 102, and therefore the inlet of the blower 50 has the same ambient pressure as the proportional valve 102.
Here, the current wind pressure value of the fan 50 may be obtained in various manners, for example, the current wind pressure value may be directly detected by a sensor, and the sensor may be directly disposed at the inlet and close to the fan 50. The sensor may be a differential pressure sensor. Alternatively, in some other embodiments, the current wind pressure value may be estimated according to the characteristics of the fan 50 and the parameters of the fan 50. The parameters of the fan 50 include, but are not limited to, a fan speed, a fan voltage, a fan current, a fan power, a fan torque, a fan air volume, and the like.
And the current compensation value calculating unit is used for obtaining the current compensation value of the proportional valve 102 according to the current wind pressure value and the current required gas quantity.
Specifically, the current compensation value of the proportional valve 102 can be obtained by:
and acquiring the current compensation value of the proportional valve 102 corresponding to the current wind pressure value and the current required gas quantity according to the second corresponding relation of the gas quantity, the wind pressure value and the current compensation value based on the current wind pressure value and the current required gas quantity. And storing the second corresponding relation of the gas quantity, the wind pressure value and the current compensation value in a data table.
In a specific application example, the standard current corresponding to each gas quantity can be detected by adjusting the gas quantity of a prototype under a standard working condition, so that a first corresponding relation between the gas quantity and the standard current of the proportional valve is obtained, and then the current target current is detected by adjusting the wind pressure value and the gas quantity, so that a third corresponding relation between the gas quantity, the wind pressure value and the target current is obtained. It should be noted that the first corresponding relationship and the third corresponding relationship are both a data table (hereinafter, the first corresponding relationship is defined as a first data table, and the third corresponding relationship is defined as a third data table), so after the first corresponding relationship and the third corresponding relationship are obtained, the corresponding data in the two data tables are subtracted to obtain a second corresponding relationship (defined as a second data table) of the gas quantity, the wind pressure value and the current compensation value, and the obtained second corresponding relationship of the gas quantity, the wind pressure value and the current compensation value is stored in the data table. The specific subtraction operation of the corresponding data in the two data tables is as follows: and selecting the gas quantity and the wind pressure value in the third data table, and subtracting the standard current corresponding to the corresponding gas quantity in the first data table from the corresponding target current to obtain a compensation current so as to obtain a second data table (namely a second corresponding relation of the gas quantity, the wind pressure value and the current compensation value).
Further, when the second corresponding relationship of the gas amount, the wind pressure value, and the current compensation value is expressed in a mathematical form, it can be expressed by the following equation:
specifically, the current compensation value of the proportional valve 102 satisfies:
wherein the g function is the characteristic curve, Q, of the proportional valve 102gIs the gas quantity required currently, and is the current wind pressure value delta p0The current compensation value is a standard wind pressure value under a standard working condition, delta I is a current compensation value, and k is a coefficient. From (equation 2), it can be seen that the current compensation value Δ I depends on the currently required gas quantity QgAnd the wind current pressure value Δ p.
Understandably, the gas quantity Q per the current demandgCorresponding determined Δ p0However, the current wind pressure value of the fan under the actual working condition is not Δ p0However, Δ p, that is, under the actual working condition, the current wind pressure value of the fan 50 is changed, and therefore, the actual current of the proportional valve 102 cannot be the standard current under the standard working condition, and therefore, the current of the proportional valve 102 needs to be properly compensated, and further, the current compensation value needs to be determined, and the actual current (i.e., the current target current) of the proportional valve 102 is obtained through the current compensation value.
It should be noted that the current compensation value Δ I and the current required gas quantity QgThe current wind pressure value delta p has a functional relation, namely the fuel gas quantity Q required at presentgThe two variables of the current wind pressure value Δ p obtain the current compensation value Δ I, and do not necessarily need to use the equation (2 equation) to calculate the current compensation value Δ I.
And the target current obtaining unit is used for obtaining the current target current of the proportional valve 102 according to the current standard current and the current compensation value.
Specifically, the current target current of the proportional valve 102 may be obtained by summing the obtained current standard current and the current compensation value. When expressed in mathematical form, there are:
I＝I0+ Δ I; (3 type)
Wherein, I is the current target current.
In the embodiment of the invention, the fuel gas Q is required according to the current requirementgAcquiring gas quantity Q corresponding to current demand from data tablegCorresponding standard current I of the proportional valve 102 under the standard working condition0Then, calling a second data table from the data table to acquire the gas quantity Q corresponding to the current demand from the second data tablegThe current compensation value delta I corresponding to the current wind pressure value is used for further obtaining the standard current I0And the current target current I of the proportional valve 102 is obtained by adding the current compensation value Δ I.
And the control unit is used for adjusting the current opening degree of the proportional valve 102 according to the current target current so as to control the gas quantity of the gas device.
Specifically, after the current target current of the proportional valve 102 is obtained, the control unit directly adjusts the current of the proportional valve 102 according to the obtained current target current, so as to achieve the purpose of adjusting the current opening degree of the proportional valve 102, and the current opening degree of the proportional valve 102 meets the actual opening degree requirement by adjusting the current of the proportional valve 102, so as to ensure that the gas quantity actually obtained in the chamber 20 reaches the currently required gas quantity (Q)g) So as to ensure that a sufficient gas quantity can be obtained in the cavity 20 and avoid the problems of idle combustion and the like.
The invention also provides a wall-mounted gas stove, and the wall-mounted gas stove can dynamically adjust the gas quantity by adopting the gas quantity control method disclosed by the embodiment of the invention. Specifically, the gas wall-hanging stove includes a chamber 20, a fan 50 for blowing air into the chamber 20, and a proportional valve 102 for adjusting the gas intake amount, and further includes: a control device electrically connected to the proportional valve 102, the control device being configured to:
acquiring the currently required gas quantity, and acquiring the current standard current of the proportional valve 102 under the standard working condition according to the currently required gas quantity; acquiring a current wind pressure value of the fan 50; the current wind pressure value of the fan 50 is the difference value between the air pressure value at the outlet of the fan and the air pressure value at the inlet of the fan; obtaining a current compensation value of the proportional valve 102 according to the current wind pressure value and the current required gas quantity; obtaining a current target current of the proportional valve 102 according to the current standard current and the current compensation value; and adjusting the current opening degree of the proportional valve 102 according to the current target current so as to control the gas quantity of the gas wall-hanging stove.
The invention also provides a gas water heater, and the gas water heater can dynamically adjust the gas quantity by adopting the gas quantity control method disclosed by the embodiment of the invention. Specifically, the gas water heater comprises a chamber 20, a fan 50 for blowing air into the chamber 20, and a proportional valve 102 for adjusting the gas intake quantity, and further comprises: a controller electrically connected to the proportional valve 102, the controller being configured to:
acquiring the currently required gas quantity, and acquiring the current standard current of the proportional valve 102 under the standard working condition according to the currently required gas quantity; acquiring a current wind pressure value of the fan 50; the current wind pressure value of the fan 50 is a difference value between an air pressure value at the outlet of the fan 50 and an air pressure value at the inlet of the fan 50; obtaining a current compensation value of the proportional valve 102 according to the current wind pressure value and the current required gas quantity; obtaining a current target current of the proportional valve 102 according to the current standard current and the current compensation value; and adjusting the current opening degree of the proportional valve 102 according to the current target current so as to control the gas quantity of the gas water heater.
The invention also provides a gas heating and ventilating system which can dynamically adjust the gas quantity by adopting the gas quantity control method disclosed by the embodiment of the invention. Specifically, the gas heating and ventilation system includes a chamber 20, a blower 50 for blowing air into the chamber 20, and a proportional valve 102 for adjusting the gas intake amount, and further includes: a control chip electrically connected to the proportional valve 102, the control chip being configured to perform the following actions:
acquiring the currently required gas quantity, and acquiring the current standard current of the proportional valve 102 under the standard working condition according to the currently required gas quantity; acquiring a current wind pressure value of the fan 50; the current wind pressure value of the fan 50 is a difference value between an air pressure value at the outlet of the fan 50 and an air pressure value at the inlet of the fan 50; obtaining a current compensation value of the proportional valve 102 according to the current wind pressure value and the current required gas quantity; obtaining a current target current of the proportional valve 102 according to the current standard current and the current compensation value; and adjusting the current opening degree of the proportional valve 102 according to the current target current so as to control the gas quantity of the gas heating and ventilating system.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. A gas amount control method for controlling a gas amount of a gas appliance, the gas appliance comprising: the device comprises a chamber, a fan and a proportional valve, wherein the fan is used for blowing air into the chamber, and the proportional valve is used for adjusting the gas inlet quantity, and is characterized in that the method comprises the following steps:
acquiring the gas quantity required currently, and acquiring the current standard current of the proportional valve under the standard working condition according to the gas quantity required currently;
acquiring a current wind pressure value of the fan; the current wind pressure value of the fan is the difference value of the air pressure value of the fan outlet and the air pressure value of the fan inlet;
obtaining a current compensation value of the proportional valve according to the current wind pressure value and the currently required gas quantity;
obtaining the current target current of the proportional valve according to the current standard current and the current compensation value;
and adjusting the current opening of the proportional valve according to the current target current so as to control the gas quantity of the gas device.
2. The gas amount control method according to claim 1, wherein the current wind pressure value is obtained by sensor detection;
or, the current wind pressure value is obtained by calculation according to the characteristics of the fan and the parameters of the fan.
3. The gas amount control method according to claim 1, wherein the obtaining of the present standard current of the proportional valve under the standard condition based on the present required gas amount includes:
based on the currently required gas quantity, acquiring the current standard current of the proportional valve corresponding to the currently required gas quantity under a standard working condition according to the first corresponding relation between the gas quantity and the standard current of the proportional valve;
wherein the first corresponding relation between the gas quantity and the standard current of the proportional valve is stored in a data table.
4. The gas amount control method according to claim 1, wherein the obtaining of the current compensation value of the proportional valve according to the current wind pressure value and the currently required gas amount comprises:
based on the current wind pressure value and the currently required gas quantity, acquiring a current compensation value of the proportional valve corresponding to the current wind pressure value and the currently required gas quantity according to a second corresponding relation of the gas quantity, the wind pressure value and the current compensation value; and storing a second corresponding relation of the gas quantity, the wind pressure value and the current compensation value in a data table.
5. The gas amount control method according to claim 3, characterized by further comprising:
under a standard working condition, detecting the standard current of the proportional valve corresponding to each gas quantity by adjusting the gas quantity, thereby obtaining a first corresponding relation between the gas quantity and the standard current of the proportional valve.
6. The gas amount control method according to claim 1, wherein the obtaining of the present target current of the proportional valve based on the present standard current and the present current compensation value includes:
summing the present standard current and the present current compensation value to obtain the present target current.
7. A gas amount control system, comprising: the cavity, be used for to blow into the fan of air and the proportional valve that is used for adjusting the gas intake flow in the cavity, its characterized in that still includes:
the first acquisition unit is used for acquiring the currently required gas quantity and acquiring the current standard current of the proportional valve under the standard working condition according to the currently required gas quantity;
the second acquisition unit is used for acquiring the current wind pressure value of the fan; the current wind pressure value of the fan is the difference value of the air pressure value of the fan outlet and the air pressure value of the fan inlet;
the current compensation value acquisition unit is used for acquiring a current compensation value of the proportional valve according to the current wind pressure value and the currently required gas quantity;
the target current obtaining unit is used for obtaining the current target current of the proportional valve according to the current standard current and the current compensation value;
and the control unit is used for adjusting the current opening of the proportional valve according to the current target current so as to control the gas quantity of the gas device.
8. The utility model provides a gas hanging stove, includes the cavity, is used for to the fan of air is bloated into in the cavity and be used for adjusting the proportional valve of gas air input, its characterized in that still includes: a control device electrically connected to the proportional valve, the control device configured to:
acquiring the gas quantity required currently, and acquiring the current standard current of the proportional valve under the standard working condition according to the gas quantity required currently;
acquiring a current wind pressure value of the fan; the current wind pressure value of the fan is the difference value of the air pressure value of the fan outlet and the air pressure value of the fan inlet;
obtaining a current compensation value of the proportional valve according to the current wind pressure value and the currently required gas quantity;
obtaining the current target current of the proportional valve according to the current standard current and the current compensation value;
and adjusting the current opening of the proportional valve according to the current target current so as to control the gas quantity of the gas wall-hanging stove.
9. A gas water heater comprises a chamber, a fan used for blowing air into the chamber and a proportional valve used for adjusting the gas intake quantity, and is characterized by further comprising: a controller electrically connected to the proportional valve, the controller configured to:
acquiring the gas quantity required currently, and acquiring the current standard current of the proportional valve under the standard working condition according to the gas quantity required currently;
acquiring a current wind pressure value of the fan; the current wind pressure value of the fan is the difference value of the air pressure value of the fan outlet and the air pressure value of the fan inlet;
obtaining a current compensation value of the proportional valve according to the current wind pressure value and the currently required gas quantity;
obtaining the current target current of the proportional valve according to the current standard current and the current compensation value;
and adjusting the current opening of the proportional valve according to the current target current so as to control the gas quantity of the gas water heater.
10. The utility model provides a gas heating and ventilating system, includes the cavity, is used for to blow into the fan of air and the proportional valve that is used for adjusting the gas air input in the cavity, its characterized in that still includes: the control chip is electrically connected with the proportional valve and is used for:
acquiring the gas quantity required currently, and acquiring the current standard current of the proportional valve under the standard working condition according to the gas quantity required currently;
acquiring a current wind pressure value of the fan; the current wind pressure value of the fan is the difference value of the air pressure value of the fan outlet and the air pressure value of the fan inlet;
obtaining a current compensation value of the proportional valve according to the current wind pressure value and the currently required gas quantity;
obtaining the current target current of the proportional valve according to the current standard current and the current compensation value;
and adjusting the current opening of the proportional valve according to the current target current so as to control the gas quantity of the gas heating and ventilating system.
Priority Applications (1)
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| CN201910614100.6A CN112212357A (en) | 2019-07-09 | 2019-07-09 | Gas quantity control method, gas wall-mounted furnace, gas water heater and heating and ventilation system |
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| CN201910614100.6A CN112212357A (en) | 2019-07-09 | 2019-07-09 | Gas quantity control method, gas wall-mounted furnace, gas water heater and heating and ventilation system |
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